Welcome to the auto customizing group of SmartGuy.com, Feel free to interact with other professionals from across the world. You can find professionals, find deals on services, find professionals who might barter, or simple post questions, comments, or suggestions. Auto customizing is a process where a passenger vehicle is substantially altered to improve its performance, often by altering or replacing the engine and transmission; made into a personal "styling" statement, using paint jobs and aftermarket accessories to make the car look unlike any car as delivered from the factory; or some combination of performance modifying and appearance changes.